@Paulyboi1612 honesty, your new provider simply lied to you, which you might want to take into consideration when the contract is up for renewal!
As for your wife, well assume that the email address might well vanish tomorrow, or next week, or next month etc. - but it absolutely will go, so while it is still working, firstly set up an alternative email address, gmail or outlook whatever, go through all the contacts and inform them of this new address. Set up a forwarder for the existing VM address to the new one. Should be fine.
What I will do if flag this thread for the forum staff, they should see it and offer to get in touch via personal message and see if anything can be done to give you temporary (and I do stress the term temporary, there have been a couple of posts where ex-users have been granted access to their mailboxes, done nothing about it for months and then complained when the mailbox was finally deleted and wanted/demanded an extension because, we’ll basically they couldn’t be bothered to do anything.
My response then is basically tough, you get one chance, you couldn’t be bothered, enjoy the lose of all your email!
Please, your email address might be beyond any help, but while it still works, your wife’s still has a good chance of being migrated fairly seamlessly.